How to make and save a video(avi) in matlab - matlab

Question

I am learning matlab myself andI have made an animated plot using matlab;now i want to save it as an video file.can you tell me how to convert my animation into a video file in matlab.Below is my code
x=[1:2];
for i=1:25,
m=randi([3,5]);
n=randi([3,5]);
y=[m n];
bar(x,y)
axis equal
A(i) = getframe;
end
matlab version 7.8 R2009a

Answer 1

use avifile:
aviobj = avifile('example.avi','compression','None');
x=[1:2];
for i=1:25,
m=randi([3,5]);
n=randi([3,5]);
y=[m n];
bar(x,y)
axis equal
aviobj = addframe(aviobj,gcf);
drawnow
end
viobj = close(aviobj)

Answer 2

If Matlab's avifile doesn't work (it might have problems with codecs of 64-bit OS), then use mmwrite.
http://www.mathworks.com/matlabcentral/fileexchange/15881-mmwrite
It's simple, and it works. I used it to create *.wmv files simply by:
mmwrite(filename, frames);
Edit: code example
% set params
fps = 25;
n_samples = 5 * fps;
filename = 'd:/rand.wmv';
% allocate frames struct
fig = figure;
f = getframe(fig);
mov = struct('frames', repmat(f, n_samples, 1), ...
'times', (1 : n_samples)' / fps, ...
'width', size(f.cdata, 2), ...
'height', size(f.cdata, 1));
% generate frames
for k = 1 : n_samples
imagesc(rand(100), [0, 1]);
drawnow;
mov.frames(k) = getframe(fig);
end
% save (assuming mmwrite.m is in the path)
mmwrite(filename, mov);

Answer 3

One way to do this is to print the figure to an image, and then stitch the resulting image sequence into a video. ffmpeg and mencoder are great tools for doing this. There are some great resources for describing this if you know the right search terms. I like this one
In mencoder, you could stitch your images together with a command like:
mencoder "mf://*.jpg" -mf fps=10 -o test.avi -ovc lavc -lavcopts vcodec=msmpeg4v2:vbitrate=800

Answer 4

Have a look at VideoWriter or see this forum discussion